Image capturing lens, optical apparatus having same, and method for manufacturing image-capturing lens

Abstract

An image-capturing lens has, in order from an object, an object side lens group G 1 and an image side lens group G 2 which is disposed next to the object side lens group G 1 with an air space, and focusing is performed from a distant object to a close object by moving at least a part of the image side lens group G 2 along an optical axis as a focusing lens group, and image stabilization is performed by moving at least a part of the image side lens group G 2 as a shift lens group so as to have components roughly orthogonal to the optical axis.

What is claimed is: 
     
       1. An image-capturing lens comprising, in order from an object, an object side lens group having at least two lenses, and an image side lens group which is disposed next to the object side lens group with an air space,
 an aperture stop being disposed between the object side lens group and the image side lens group, 
 focusing being performed from a distant object to a close object by moving the image side lens group along an optical axis as a focusing lens group, 
 image stabilization being performed by moving at least a part of the image side lens group, as a shift lens group, so as to have a motion component substantially orthogonal to the optical axis, 
 the object side lens group and the image side lens group having positive refractive power, and 
 the following conditional expression being satisfied:
   9.7902≦( r 2 F+r 1R)/( r 2 F−r 1R)<24.8
 
 
 where r 1 R denotes a radius of curvature of an image side surface of a lens closest to the object in the object side lens group, and r 2 F denotes a radius of curvature of an object side surface of a lens disposed at the image side of the lens closest to the object in the object side lens group, and 
 wherein the following conditional expression is satisfied:
   0.27<Σd2/f<0.60
 
 
 where f denotes a focal length of the image-capturing lens, and Σd 2  denotes a length on the optical axis from a lens surface closest to the object to a lens surface closest to the image in the image side lens group. 
 
     
     
       2. The image-capturing lens according to  claim 1 , wherein at least a part of the focusing lens group is the shift lens group. 
     
     
       3. The image-capturing lens according to  claim 1 , wherein the following conditional expression is satisfied:
   0.06<|f2|/|f1|<0.49 
 where f 1  denotes a focal length of the object side lens group, and f 2  denotes a focal length of the image side lens group. 
 
     
     
       4. The image-capturing lens according to  claim 1 , wherein the following conditional expression is satisfied:
   0.80<f/|fs|<1.10 
 where f denotes a focal length of the image-capturing lens, and fs denotes a focal length of the shift lens group. 
 
     
     
       5. The image-capturing lens according to  claim 1 , wherein the following conditional expression is satisfied:
   1.5<TL/Σd<2.3
 
 where TL denotes a total length of the image-capturing lens, and Σd denotes a length, on the optical axis, from a lens surface closest to the object in the object side lens group to a lens surface closest to the image in the image side lens group. 
 
     
     
       6. The image-capturing lens according to  claim 1 , wherein the focusing lens group is the shift lens group. 
     
     
       7. The image-capturing lens according to  claim 1 , wherein the focal length of the image-capturing lens is fixed. 
     
     
       8. The image-capturing lens according to  claim 1 , wherein the image side lens group has a positive lens component, and the positive lens component includes at least one aspherical surface. 
     
     
       9. The image-capturing lens according to  claim 1 , wherein the image side lens group has a negative lens component disposed closest to the object, and a positive lens component disposed at the image side of the negative lens component. 
     
     
       10. The image-capturing lens according to  claim 1 , wherein the image side lens group has a cemented lens which has a negative lens component and a positive lens component, and has a positive or negative refractive power. 
     
     
       11. The image-capturing lens according to  claim 1 , wherein the image side lens group has a cemented lens of a negative meniscus lens having a concave surface facing the object, and a positive meniscus lens having a convex surface facing the image. 
     
     
       12. An optical apparatus having an image-capturing lens for forming an image of an object on a predetermined image plane,
 the image-capturing lens being the image-capturing lens according to  claim 1 . 
 
     
     
       13. A method for manufacturing an image-capturing lens, the method comprising:
 disposing, in order from an object, an object side lens group which has positive refractive power and which has at least two lenses, and an image side lens group which is disposed next to the object side lens group with an air space and which has positive refractive power, with an aperture stop being disposed between the object side lens group and the image side lens group; 
 the image side lens group being movable in the optical axis direction, as a focusing lens group, upon focusing from a distant object to a close object; 
 at least a part of the image side lens group being movable, as a shift lens group, so as to have a motion component substantially orthogonal to the optical axis upon stabilizing an image; and 
 satisfying the following conditional expression:
   9.7902≦(r2F+r1R)/(r2F−r1R)<24.8
 
 
 where r 1 R denotes a radius of curvature of an image side surface of a lens closest to the object in the object side lens group, and r 2 F denotes a radius of curvature of an object side surface of a lens disposed at the image side of the lens closest to the object in the object side lens group, and 
 wherein the following conditional expression is satisfied:
   0.27<Σd2/f<0.60
 
 
 where f denotes a focal length of the image-capturing lens, and Σd 2  denotes a length on the optical axis from a lens surface closest to the object to a lens surface closest to the image in the image side lens group. 
 
     
     
       14. The method for manufacturing an image-capturing lens according to  claim 13 , wherein the following conditional expression is satisfied:
   1.5<TL/Σd<2.3
 
 where TL denotes a total length of the image-capturing lens, and Σd denotes a length, on the optical axis, from a lens surface closest to the object in the object side lens group to a lens surface closest to the image in the image side lens group. 
 
     
     
       15. An image-capturing lens comprising, in order from an object, an object side lens group having at least two lenses, and an image side lens group which is disposed next to the object side lens group with an air space, the image side lens group having a negative lens component disposed closest to the object, and a positive lens component disposed at the image side of the negative lens component,
 an aperture stop being disposed between the object side lens group and the image side lens group, 
 focusing being performed from a distant object to a close object by moving the image side lens group along an optical axis as a focusing lens group, 
 image stabilization being performed by moving at least a part of the image side lens group, as a shift lens group, so as to have a motion component substantially orthogonal to the optical axis, 
 the object side lens group and the image side lens group having positive refractive power, and 
 the following conditional expression being satisfied:
   9.7902≦(r2F+r1R)/(r2F−r1R)<24.8
 
 
 where r 1 R denotes a radius of curvature of an image side surface of a lens closest to the object in the object side lens group, and r 2 F denotes a radius of curvature of an object side surface of a lens disposed at the image side of the lens closest to the object in the object side lens group.